First slide

Electronic configuration and Atomic , physical properties

Question

The solubility of iodine in water increases in the presence of

Moderate

A

Alcohol
B

Chloroform
C

Sodium hydroxide
D

Potassium iodide

Solution

Iodine has the least affinity for water and is only slightly soluble in it. However, it dissolves in 10% aq. solution of KI due to the formation of a complex ion i.e. $I_{3}^{-}$ .
$I_{2} + KI ⇌ {KI}_{3} or I_{2} + I^{-} ⇌ I_{3}^{-} (complex ion)$

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